Muscle

Question 1

Muscles

Answer 1

Without muscles, the body would be immobile. The skeleton determines the size of the body’s framework and the muscles and fat determine the body shape.

All muscle tissues have specific characteristics of contractility, extensibility, elasticity, and irritability.

Question 2

Function: Voluntary movement

Answer 2

enables walking, standing, sitting, chewing, and other movements. Also maintains the body in an upright position and participates in body balance.

Question 3

Function: Involuntary movement

Answer 3

provides involuntary movement such as maintaining the heartbeat to pump blood, arterial blood flow, promotes lymphatic and venous blood return to the heart, dilate and contract blood vessels to control blood flow, maintains respiration with the largest muscle of respiration known as the diaphragm, perform digestive and elimination processes, and participates in reflexes.

Question 4

Function: Protection

Answer 4

utilizes emergency reflexes to protect the body, covers, surrounds and protects internal (visceral) organs, and supports internal organs.

Question 5

Muscle classifications

Answer 5

there are 3 types of muscle tissue by function and also identified by appearance. Striation are fibers marked by bands and appearing striped.

Question 6

Smooth muscles

Answer 6

forms part of the walls of blood vessels and hollow internal organs. Smooth muscles controls involuntary motions and is responsible for actions such as propelling urine, moving food through the digestive tract, and dilating the pupils of the eyes. Blood vessel dilation and contraction is controlled by smooth muscle.

Question 7

Cardiac muscles

Answer 7

found in the myocardium layer of the heart: and propels blood through the blood vessels. Cardiac muscles works automatically, contracts, and relaxes in short, intense burst. Structure of cardiac muscles are similar to skeletal muscles even though they are involuntary. The cardiac muscle is self-excitatory and influenced by the nervous system and hormones.

Question 8

Skeletal muscles

Answer 8

Skeletal muscles are voluntary and long, cylindrical, multinucleated and heavily striated. Skeletal muscles produce movements at joints stimulated by the nervous system, contracts, relaxes rapidly, and produces heat through aerobic production of energy.

Question 9

Tendons

Answer 9

Attach muscles to bones. Tendons feel tough, fibrous, and rope-like.

The Achilles tendon is an example of a tendon attaching calf muscles to the heel.

Question 10

Muscle contractions

Answer 10

Muscle has characteristics broken down into four categories. Elasticity of muscles allow them to work in pairs.

Question 11

Characteristics: Contractility

Answer 11

ability to shorten and become thicker

Question 12

Characteristics: Extensibility

Answer 12

ability to stretch

Question 13

Characteristics: Elasticity

Answer 13

ability to return to normal length after stretching

Question 14

Characteristics: Irritability

Answer 14

ability to respond to a stimulus (nerve impulses)